Tai Chi on psychological well-being: systematic review and meta-analysis.

Background: Physical activity and exercise appear to improve psychological health. However, the quantitative effects of Tai Chi on psychological well-being have rarely been examined. We systematically reviewed the effects of Tai Chi on stress, anxiety, depression and mood disturbance in eastern and western populations.

Smoking as a risk factor for prostate cancer: a meta-analysis of 24 prospective cohort studies.

Objectives: We evaluated the relationship between smoking and adenocarcinoma of the prostate.

Methods: We pooled data from 24 cohort studies enrolling 21 579 prostate cancer case participants for a general variance-based meta-analysis. Summary relative risks (RRs) and 95% confidence intervals (CIs) were calculated separately for mortality and incidence studies.

Colorectal cancer risk and dietary intake of calcium, vitamin D, and dairy products: a meta-analysis of 26,335 cases from 60 observational studies.

In vivo and in vitro studies suggest that dairy products, calcium, and dietary vitamin D inhibits the development of colorectal cancer (CRC). A meta-analysis was performed to evaluate this relationship in observational studies. Data from 60 epidemiological studies enrolling 26,335 CRC cases were pooled using a general variance-based meta-analytic method.

Pregnancy outcome of migrant women and integration policy: a systematic review of the international literature.

Immigrant mothers in developed countries often experience worse pregnancy outcomes than native women. Several epidemiological studies have described the pregnancy outcome of immigrant women in European receiving countries, with conflicting results. The present systematic review makes a quantitative synthesis of available evidence on the association between pregnancy outcomes and integration policies.

Dairy products, dietary calcium and vitamin D intake as risk factors for prostate cancer: a meta-analysis of 26,769 cases from 45 observational studies.

In this study, we examined the available evidence and sources of heterogeneity for studies of dairy products, calcium, and vitamin D intake and the risk of prostate cancer. We pooled data from 45 observational studies using a general variance-based, meta-analytic method employing CIs. Summary relative risks (RRs) were calculated for specific dairy products such as milk and dairy micronutrients.